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Model Tests on the Economy and Effectiveness of Helicopter Propellers (1925)
NASA Technical Reports Server (NTRS) · leaf 27
At N.A.C.A. Technical Note No.221 Figs.4 & 5. 1.95cm wide * 1. 5cm -^K-/ | l|j6. 4cm ^—o.5cm cs o J o -4 ir~ 5.8cm Leading edge to leading edge of tail = 3.6cm Fig.4. 81.3cm " > … Fig.5.NASA Technical Reports Server (NTRS)
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